4b: Energy Transfers

Which of the following are energy stores (in iGCSE Physics)?

• Kinetic
• gravitational potential energy
• Sound
• chemical
• Light

Which of the following are energy stores (in iGCSE Physics)?

• Mechanical
• Electrical
• Internal
• elastic
• magnetic

Which of the following are energy stores (in iGCSE Physics)?

• gravitational field strength
• Fossil fuels
• electrostatic
• nuclear
• thermal

What energy transfer mechanism is used when a force is applied to an object?

• Work is done by heating
• Mechanical work is done
• Work is done by radiation
• Electrical work is done

What energy transfer mechanism is used in an electric circuit?

• Work is done by heating
• Mechanical work is done
• Work is done by radiation
• Electrical work is done

What energy transfer mechanism is used to produce light or sound?

• Work is done by heating
• Mechanical work is done
• Work is done by radiation
• Electrical work is done

What energy transfer mechanism can be achieved by conduction, convection, or radiation?

• Work is done by heating
• Mechanical work is done
• Work is done by radiation
• Electrical work is done

What is work done?

• Power
• Having a job
• Energy transferred
• The energy transfer mechanism used when a force is applied to an object

What is the conservation of energy?

• energy cannot change
• energy cannot be created or destroyed
• kinetic energy before a collision = kinetic energy after a collision
• Every energy has an equal and opposite energy

What is the relationship between efficiency, useful energy output, and total energy output?

• efficiency = useful energy output + total energy output
• efficiency = total energy output ÷ useful energy output
• efficiency = useful energy output ÷ total energy output
• efficiency = useful energy output × total energy output